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Commit 83c1f36f authored by Sabrina Dubroca's avatar Sabrina Dubroca Committed by David S. Miller
Browse files

tun: send netlink notification when the device is modified 



I added dumping of link information about tun devices over netlink in
commit 1ec010e7 ("tun: export flags, uid, gid, queue information
over netlink"), but didn't add the missing netlink notifications when
the device's exported properties change.

This patch adds notifications when owner/group or flags are modified,
when queues are attached/detached, and when a tun fd is closed.

Reported-by: default avatarThomas Haller <thaller@redhat.com>
Fixes: 1ec010e7 ("tun: export flags, uid, gid, queue information over netlink")
Signed-off-by: default avatarSabrina Dubroca <sd@queasysnail.net>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 9fffc5c6

drivers/net/tun.c

+22 −2
Original line number Diff line number Diff line
@@ -743,8 +743,15 @@ static void __tun_detach(struct tun_file *tfile, bool clean) 


static void tun_detach(struct tun_file *tfile, bool clean)

{

	struct tun_struct *tun;

	struct net_device *dev;



	rtnl_lock();

	tun = rtnl_dereference(tfile->tun);

	dev = tun ? tun->dev : NULL;

	__tun_detach(tfile, clean);

	if (dev)

		netdev_state_change(dev);

	rtnl_unlock();

}
@@ -2562,13 +2569,15 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr) 
			/* One or more queue has already been attached, no need

			 * to initialize the device again.

			 */

			netdev_state_change(dev);

			return 0;

		}



		tun->flags = (tun->flags & ~TUN_FEATURES) |

			      (ifr->ifr_flags & TUN_FEATURES);

	}

	else {



		netdev_state_change(dev);

	} else {

		char *name;

		unsigned long flags = 0;

		int queues = ifr->ifr_flags & IFF_MULTI_QUEUE ?
@@ -2808,6 +2817,9 @@ static int tun_set_queue(struct file *file, struct ifreq *ifr) 
	} else

		ret = -EINVAL;



	if (ret >= 0)

		netdev_state_change(tun->dev);



unlock:

	rtnl_unlock();

	return ret;
@@ -2848,6 +2860,7 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd, 
	unsigned int ifindex;

	int le;

	int ret;

	bool do_notify = false;



	if (cmd == TUNSETIFF || cmd == TUNSETQUEUE ||

	    (_IOC_TYPE(cmd) == SOCK_IOC_TYPE && cmd != SIOCGSKNS)) {
@@ -2944,10 +2957,12 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd, 
		if (arg && !(tun->flags & IFF_PERSIST)) {

			tun->flags |= IFF_PERSIST;

			__module_get(THIS_MODULE);

			do_notify = true;

		}

		if (!arg && (tun->flags & IFF_PERSIST)) {

			tun->flags &= ~IFF_PERSIST;

			module_put(THIS_MODULE);

			do_notify = true;

		}



		tun_debug(KERN_INFO, tun, "persist %s\n",
@@ -2962,6 +2977,7 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd, 
			break;

		}

		tun->owner = owner;

		do_notify = true;

		tun_debug(KERN_INFO, tun, "owner set to %u\n",

			  from_kuid(&init_user_ns, tun->owner));

		break;
@@ -2974,6 +2990,7 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd, 
			break;

		}

		tun->group = group;

		do_notify = true;

		tun_debug(KERN_INFO, tun, "group set to %u\n",

			  from_kgid(&init_user_ns, tun->group));

		break;
@@ -3133,6 +3150,9 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd, 
		break;

	}



	if (do_notify)

		netdev_state_change(tun->dev);



unlock:

	rtnl_unlock();

	if (tun)